纯php文件 关闭标签?>可以不写 防止末尾出现异常的空格什么的。。。

For files that contain only PHP code, the closing tag ("?>") is never permitted. It is not required byPHP, and omitting it´ prevents the accidental injection of trailing white space into the response.

http://framework.zend.com/manual/en/coding-standard.php-file-formatting.html#coding-standard.php-file-formatting.general